Photography is the process, activity and art of creating still or moving pictures by recording radiation on a sensitive medium, such as a film, or an electronic sensor. Light patterns reflected or emitted from objects activate a sensitive chemical or electronic sensor during a timed exposure, usually through a photographic lens in a device known as a camera that also stores the resulting information chemically or electronically. Photography has many uses for business, science, art and pleasure.

Lens and mounting of a large-format camera.A historic camera: the Contax S of 1949 — the first pentaprism SLR. Nikon F of 1959 — the first 35mm film system camera.

Late Production Minox B camera with later style "honeycomb" selenium light meterThe word "photography" comes from the Greek (phos) "light" + (graphis) "stylus", "paintbrush" "representation by means of lines" or "drawing", together meaning "drawing with light." Traditionally, the products of photography have been called negatives and photographs, commonly shortened to photos.

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A picture, also called an image, is a group of colored points on a flat surface that looks the same as something else. For example, a picture can look the same as an object or a person. Pictures can also be drawings, paintings or photographs. People who make such pictures are called artists, photographers or painters. Pictures are very helpful. Sometimes people say pictures are worth a thousand words.